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tkhunny
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tkhunny
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Join Date
04-12-2005
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Today
11:48 AM
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Today,
11:47 AM
tkhunny
replied to a thread
Integration of Logarithmic Functions
in
Calculus
Try u = e^{x} + 1. Please read and heed my signature. This has other implications, such as, if you get two different answers, one of them most...
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3 replies | 46 view(s)
Today,
11:42 AM
tkhunny
replied to a thread
Volume of a solid using shell method
in
Arithmetic
?? Why have you added it? The distance between two curves is obtained by subtraction. Maybe I'm not understanding your question.
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1 replies | 26 view(s)
Today,
10:23 AM
tkhunny
replied to a thread
Limits problem
in
Calculus
You gave up too soon AND you already did too much work trying to multiply that annoying numerator. Do this: 1) Do NOT multiply the complicated...
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1 replies | 32 view(s)
Today,
10:20 AM
tkhunny
replied to a thread
Weight factors(values)
in
Advanced Math
For many models, if your translations and rotations can be treated as Random Variables, then the reciprocal of the Variance can produce acceptable...
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1 replies | 36 view(s)
Yesterday,
08:57 PM
tkhunny
replied to a thread
Calculus II Question
in
Calculus
1) x = 2y and x = y^2 intersect at (0,0) and (4,2). Let's work on that, first. 2) Looking from the y-axis, maybe standing at (0,1), and moving in...
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2 replies | 41 view(s)
Yesterday,
12:21 PM
tkhunny
replied to a thread
Solving 2 equations, 2 unknowns (Money Growth = Inflation + Real growth rate)
in
Beginning Algebra
Have you considered substituting the expression for "Inflation" from the second equation into "Inflation" from the first equation?
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6 replies | 136 view(s)
Yesterday,
12:18 PM
tkhunny
replied to a thread
Finding x,y and λ values from partial derivatives
in
Calculus
You should try whatever methods are available to you to solve a system of equations. In this case, your predecessor seem of have produced, via...
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3 replies | 47 view(s)
Yesterday,
12:10 PM
tkhunny
replied to a thread
Simple probability question event not occuring.
in
Probability / Statistics
If you have only one, it's a "die". Independent Events. Does any roll depend on any other roll? ^(1500) -- One must fail EVERY TIME.
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1 replies | 42 view(s)
Yesterday,
12:06 PM
tkhunny
replied to a thread
Function plug-ins: Given F(x)=x^2+2x+7, g(x)= x+3, find (f+g)(x), (g*h)(x)
in
Intermediate/Advanced Algebra
Let's first assume that F(x) is the same as f(x). Normally, this is exceptionally bad form. Don't change letters to mean the same thing. What we...
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2 replies | 79 view(s)
Yesterday,
12:02 PM
tkhunny
replied to a thread
Effective interest rate problem
in
Finance/Business Math
Compounding. It's a silly term.
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6 replies | 136 view(s)
12-12-2017,
11:56 AM
tkhunny
replied to a thread
Find Volume of Solid formed by revolving y=4−x^2, x-axis, y-axis about y=4
in
Calculus
There is a whole chapter on this in your book. I hope you have not been sleeping in class. Anyway... Consider a Right Circular Cylinder. It's...
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2 replies | 121 view(s)
12-12-2017,
11:41 AM
tkhunny
replied to a thread
Solve sec 2x = 2 between -Pi < x < Pi (can't find all the soln values)
in
Geometry and Trig
The answer is, "maybe". First, it behooves one to write ALL the solution and THEN pick the ones that are needed. No need to do the surgery up...
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5 replies | 161 view(s)
12-11-2017,
09:00 PM
tkhunny
replied to a thread
Solve sec 2x = 2 between -Pi < x < Pi (can't find all the soln values)
in
Geometry and Trig
1) cos(2x) = 1/2 has more than one solution, even on (-pi/2,pi/2). This is a natural result of the circle definition of the cosine. You must find...
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5 replies | 161 view(s)
12-11-2017,
08:51 PM
tkhunny
replied to a thread
The Brown Family Children: Charlie is the oldest child in the Brown family....
in
Beginning Algebra
It is very, very difficult for you to show your work if you just copy it from someone else. You MUST have SOME idea or it is horribly unfair for you...
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4 replies | 119 view(s)
12-11-2017,
11:17 AM
tkhunny
replied to a thread
non homogeneous general solution to d^2x/dt^2 + 2dx/dt-3x=5e^-t+sin3t
in
Differential Equations
In order for anyone to check your work, you will have to show some work. Just dropping your final answer doesn't help anyone. What methods did...
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1 replies | 88 view(s)
12-10-2017,
08:58 PM
tkhunny
replied to a thread
Finding the x-intercept of f(x) = x + cos(x)
in
Calculus
No, I think you have it. There are many interesting methods for finding numerical solutions where your algebraic efforts prove insufficient. Some...
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1 replies | 95 view(s)
12-09-2017,
12:09 AM
tkhunny
replied to a thread
Need Help w/ Implicit differentiation problem: y^3+x^2y=tan^-1y
in
Calculus
I think I can tell you what is going wrong. 1) You have too much faith in the answers in they book. They are created by humans. They are...
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2 replies | 109 view(s)
12-09-2017,
12:03 AM
tkhunny
replied to a thread
Help w/ quiz: "You have six numbers: 123456. Divide 3-digit no. by 2-digit to get..."
in
Arithmetic
It's not clear to me what is wanted. You say there are six numbers, then you speak of "0" and "above 6", which are not in the set of numbers you...
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8 replies | 339 view(s)
12-08-2017,
12:31 PM
tkhunny
replied to a thread
SAT Math Q: If ax+4=2y+8, bx+2=4y-11, & a=3-b, then which is true?
in
Intermediate/Advanced Algebra
The methods you suggested should work just fine. Please demonstrate your efforts. You are given a = 3 - b. Why not substitute that and cut down...
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2 replies | 88 view(s)
12-08-2017,
07:14 AM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
Pick any 2x2 matrix and play with it a bit. Expand your exploration from there.
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5 replies | 273 view(s)
12-07-2017,
05:42 PM
tkhunny
replied to a thread
Question about Vertical Asymptote: y = x^3/(9-x^2)
in
Intermediate/Advanced Algebra
I knew I should have stayed in bed, this morning. I better check everything else I did all day... Maybe I didn't get out of bed. Hmmm...
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8 replies | 303 view(s)
12-07-2017,
02:34 PM
tkhunny
replied to a thread
Question about Vertical Asymptote: y = x^3/(9-x^2)
in
Intermediate/Advanced Algebra
We're using the quotient of simple, real-valued polynomials, right? Is there another definition in "Intermediate/Advance Algebra"? No example...
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8 replies | 303 view(s)
12-07-2017,
02:29 PM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
Fair enough. Now the answer to my determinant question...
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5 replies | 273 view(s)
12-07-2017,
09:24 AM
tkhunny
replied to a thread
Radians: Points A, B, C and D divide circumference of circle in the ratio 1:2:3:4...
in
Geometry and Trig
You have done well to use Central Angles to solve the first part. Now, draw the rectangle and switch your thinking to Inscribed Angles. Hint:...
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1 replies | 114 view(s)
12-07-2017,
07:09 AM
tkhunny
replied to a thread
Question about Vertical Asymptote: y = x^3/(9-x^2)
in
Intermediate/Advanced Algebra
Two things: 1a) Make the denominator 0 (zero). These are POTENTIAL vertical asymptotes. 1b) If the numerator is also zero (0) for the same...
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8 replies | 303 view(s)
12-06-2017,
09:58 PM
tkhunny
replied to a thread
Graphing region of integration of triple integral ∫01∫01-x^2∫01-x f(x,y,z)dzdydx
in
Calculus
I can't help you with the drawing, but you have... z = 1 - x -- That's a nice lean-to. y = 1 - x^2 -- That's a nice parabolic cap. You have...
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1 replies | 103 view(s)
12-06-2017,
06:50 PM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
Let's be clear. Please state what B' is. Notation isn't always uniform. Is |\lambda I - B| any different from |\lambda I - B'|
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5 replies | 273 view(s)
12-06-2017,
02:43 PM
tkhunny
replied to a thread
Derivative function: ball thrown vertically has height s = 2 + 20t - 5t^2
in
Calculus
There are basic principles you must understand. Quiz/Refresher. s(t) = 2 + 20t - 5t^2 -- This describes the height of the ball. s(0) = What?...
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4 replies | 214 view(s)
12-06-2017,
02:34 PM
tkhunny
replied to a thread
maybe a stupid question?
in
Beginning Algebra
Rule of Thumb: Concepts are more important than formula memorization - almost always. Rule of Word Problem: If you don't know what something is,...
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4 replies | 224 view(s)
12-06-2017,
02:31 PM
tkhunny
replied to a thread
A question with logarithms: Given log x = 1.322, approximate the value of log (1/x^5)
in
Intermediate/Advanced Algebra
What logarithm rules have you applied to the expression?
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2 replies | 84 view(s)
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About tkhunny
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"Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.
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